CN109039975B - Code shift keying modulation method for repeatedly shifting phase for multiple times and demodulation method thereof - Google Patents
Code shift keying modulation method for repeatedly shifting phase for multiple times and demodulation method thereof Download PDFInfo
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Abstract
The invention relates to a code shift keying modulation method for repeatedly shifting phase for many times and a demodulation method thereof. Repeatedly modulating N identical pseudo-random sequences with the same phase by a group of telegraph text consisting of a plurality of binary bits in a code shift keying mode, sequentially connecting the N pseudo-random sequences with the same initial phase to form a new modulation symbol, and finishing code shift keying modulation of repeated phase shift for multiple times; and the receiving end adopts a comb filter to superpose N sets of pseudo-random sequence data in the same received symbol into 1 set of pseudo-random sequence data, then performs matched filtering with the pseudo-random sequence locally generated by the receiving end, searches for the phase of the pseudo-random sequence corresponding to the related peak, and completes the R-CSK text demodulation. The method comprehensively considers factors such as spread spectrum gain, information transmission rate, bit error rate, modulation and demodulation signal processing complexity and the like, and has better performance compared with the conventional CSK modulation method.
Description
Technical Field
The invention belongs to the technical field of communication and navigation signal design, and particularly relates to a code shift keying modulation method for repeatedly shifting phase for multiple times and a demodulation method thereof.
Background
Compared with the DSSS direct sequence spread spectrum mode, the code shift keying modulation mode (CSK modulation mode for short) can transmit more information bits while maintaining the correlation characteristic of the spread spectrum pseudorandom sequence, and is widely applied to spread spectrum communication.
In the conventional CSK modulation mode, the symbol time length T of the modulated textSGenerally equal to the period time T of the spread spectrum pseudorandom sequenceCFor chip length L, cycle time TCThe spread spectrum pseudorandom sequence of (1) has a maximum broadcast message information rate of R ═ K/TSWherein K is 2KThe integer less than or equal to L is limited by signal transmitting power or signal power reaching the receiving end, and the actually selected K value is used to ensure that enough low error rate of information transmission is obtainedFar less than the maximum K value that could be theoretically selected.
A method for improving the information transmission rate of a CSK modulation mode is characterized in that the time length of modulating message symbols is increased while the number K of transmitted information bits in one symbol is increased, the energy of receiving signal symbols of a receiving end is improved, and the error rate of information transmission is improved. But this method also increases the cycle time T of the spread spectrum pseudo-random sequence synchronouslyCAnd the chip length L, which results in the increase of the processing capacity of the CSK modulation and demodulation signals and greatly improves the software and hardware cost and the power consumption of the receiving end for demodulating the CSK messageCMeanwhile, the chip length L of the spread spectrum pseudorandom sequence is kept unchanged, so that the increase of the processing amount of CSK modulation and demodulation signals is avoided, and the software and hardware cost and power consumption of a receiving end for demodulating CSK messages are maintained.
The code shift keying modulation method (R-CSK modulation method for short) with repeated phase shifting and the demodulation method thereof can improve the transmission rate of CSK modulation information, keep the signal power density of a receiving end unchanged and avoid greatly increasing the software and hardware cost and power consumption of the receiving end for demodulating CSK messages.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a technical method capable of effectively improving the information transmission efficiency of a code shift keying modulation and demodulation mode, and the method can be applied to text transmission signal design and signal receiver design in communication and navigation systems.
In order to solve the technical problem, the invention provides the following technical scheme:
a code shift keying modulation method with repeated phase shift for many times is characterized in that,
repeating the code shift keying modulation of the same phase for a pseudorandom sequence a plurality of times within the same transmission symbol, comprising the steps of:
firstly, performing code shift keying modulation on a given group of transmission messages by adopting a preset keying modulation method to obtain a pseudo-random sequence, wherein the phase of the pseudo-random sequence is controlled by the transmission messages;
and repeating the code shift keying modulation process for multiple times, and sequentially connecting multiple pseudo-random sequences with the same initial phase to form a modulated transmission symbol, namely a baseband signal.
As a preferred technical scheme of the invention: in the above code shift keying modulation method with multiple repeated phase shifts, a baseband signal is constructed as follows:
firstly, carrying out channel coding on a message to obtain a coded bit stream D (t);
secondly, according to the symbol clock provided by the time sequence generator, the bit stream corresponding to the encoded text is processed by 1->KRSerial/parallel conversion to obtain parallel data streams, where each KR-the bit parallel data duration (symbol time length) is equal to N times the pseudo-random sequence period time;
then, according to the pseudo-random sequence periodic clock provided by the time sequence generator, the phase selection module generates the pseudo-random sequence phase offset corresponding to the parallel data stream;
finally, according to the pseudo-random sequence period clock provided by the time sequence generator, the pseudo-random sequence chip clock and the phase offset corresponding to the parallel data stream, a preset keying modulation method is adopted to repeatedly carry out code shift keying modulation on the pseudo-random sequence generated by the pseudo-random sequence generator for multiple times, and the modulated pseudo-random sequence is obtained
I.e. the baseband signal s (t). As a preferred technical scheme of the invention: the symbol clock is integral multiple of the pseudo-random sequence period clock and is synchronous with the pseudo-random sequence period clock.
As a preferred technical scheme of the invention: in the above code shift keying modulation method with multiple repeated phase shifts, a radio frequency transmission signal is constructed as follows:
firstly, carrying out carrier modulation on a generated baseband signal S (t) to generate an intermediate frequency carrier signal, wherein the modulation adopts BPSK, QPSK, FSK or other equivalent carrier modulation modes;
secondly, performing up-conversion on the generated intermediate frequency carrier signal to a required transmitting frequency to generate a radio frequency carrier signal;
and then, performing power amplification on the generated radio frequency carrier signal, and sending the radio frequency carrier signal to a transmitting antenna.
In addition, the invention also provides a demodulation method aiming at the code shift keying modulation method for repeatedly shifting the phase for many times, which adopts the following method to realize text demodulation:
firstly, a radio frequency carrier signal received by a receiver antenna is processed by a radio frequency Front-End (RF Front-End) to output a digital intermediate frequency signal;
secondly, the digital intermediate frequency signal is transmitted to a digital down-conversion module, and the digital down-conversion module converts the digital intermediate frequency signal into IQ two-path orthogonal baseband signals under the action of a local intermediate frequency signal of an externally input receiver and a carrier Doppler frequency offset signal in a received signal;
thirdly, transmitting the IQ two-path orthogonal baseband signals to a comb filter, and controlling N time lengths in the same symbol period to be T by the comb filter under the control of an externally input symbol clock and a pseudo-random sequence period clockCIs converted into a data block with a time length of TCAnd outputting the result to the matched filtering module;
then, the matched filter module takes the received time length as T under the control of an externally input symbol clock and a pseudo-random sequence period clockCThe data block is subjected to correlation matching calculation with a pseudo-random sequence generated by a local pseudo-random sequence generator, a correlation result is output to a correlation peak searching module, a local pseudo-random sequence phase corresponding to a correlation peak is searched, and the phase is converted into bit data to be output;
and finally, the bit data output by the correlation peak searching module passes through a channel decoding module to obtain transmitted text data.
As a preferable scheme, in the demodulation method, the comb filter is implemented as follows:
firstly, the comb filter delays the input data for N-1 times in sequence under the control of the pseudo-random sequence period clock input externally, and the pseudo-random sequence period time T is delayed every timeCSecond, the N-1 time delay data and the input data are superposed and then sent to a data interception module;
secondly, the data interception module intercepts input data flow under the control of an externally input symbol clock and a pseudo-random sequence period clock, outputs data superposed for N times in the same symbol, and the data time length is pseudo-random sequence period time TCAnd second.
Compared with the prior art, the code shift keying modulation and demodulation method for repeatedly shifting the phase for multiple times has the following technical effects:
compared with the conventional CSK, the telegraph broadcasting transmitting terminal adopts the code shift keying modulation method of repeated phase shift for multiple times, so that better information transmission error rate performance can be obtained under the condition of the same effective information rate; the CSK modulation information transmission rate can be improved, meanwhile, the signal power density of a receiving end is kept unchanged, and the software and hardware cost and the power consumption of the receiving end for demodulating CSK messages are prevented from being greatly increased; the demodulation part adopts a comb filter, and superposes N groups of pseudo-random sequence data in the same received symbol into 1 group of pseudo-random sequence data, compared with the conventional CSK modulation which adopts the same pseudo-random sequence rate and the pseudo-random sequence period equal to the symbol length provided by the invention, the demodulation cost of the receiver can be effectively reduced while the same demodulation performance is ensured. The method is suitable for the fields of communication, navigation system design and the like.
Drawings
FIG. 1 is a timing diagram of R-CSK modulation;
FIG. 2 is a timing diagram of a conventional CSK modulation;
FIG. 3 is a schematic block diagram of a text transmitter according to the present invention;
FIG. 4 is a schematic block diagram of a conventional CSK modulated message receiver;
FIG. 5 is a schematic block diagram of a teletext receiver arrangement according to the invention;
FIG. 6 is a block diagram of a comb filter in a text receiver according to the present invention;
FIG. 7 is a graph comparing the effect of the R-CSK error rate of the present invention on the conventional CSK error rate.
Detailed Description
The following description will explain embodiments of the present invention in further detail with reference to the accompanying drawings.
FIG. 1 shows a timing diagram of R-CSK modulation, the symbol time length T of broadcast messageS,REqual to the period time T of the pseudorandom sequenceCBy a factor of N, using KR-bit represents a symbol, information rate RR＝KR/TS,Rbps，KR-the initial phase of the bit corresponding to the PRN is expressed as a decimal value range of
I.e. at most can represent
N identical pseudo-random sequences (i.e. K in fig. 1) are repeatedly modulated with the same phaseRAnd the bit text (m) corresponds to N PRNs (m), and N pseudo-random sequences with the same initial phase are sequentially connected to form a new modulation symbol so as to complete the code shift keying modulation of repeated phase shift for multiple times. K in FIG. 1RThe correspondence between the bit text (m) and the prn (m) is only one embodiment of the present invention, and other correspondence relationships are also possible.
FIG. 2 shows a timing diagram of a conventional CSK modulation, the symbol length T of a broadcast messageSEqual to the period length T of the pseudorandom sequenceCUsing K-bit to represent a symbol, the information rate R is K/TSThe initial phase of bps, K-bit for PRN is represented as a decimal value ranging from M to 0,1, …,2K1, i.e. can represent at most 2KAnd-1 phase, and modulating the pseudo random sequence by an initial phase represented by a K-bit symbol to complete CSK modulation. The correspondence between the K-bit text (m) and the PRN (m) in FIG. 2 is only an embodiment of the present invention, and other correspondence relationships are also possible.
In practical application, as shown in fig. 3, the code shift keying modulation method for repeatedly shifting phase for many times is adopted to realize broadcast of telegraph text.
Firstly, performing code shift keying modulation on a given group of transmission messages by adopting a preset keying modulation method to obtain a pseudo-random sequence, wherein the phase of the pseudo-random sequence is controlled by the transmission messages;
and repeating the code shift keying modulation process for multiple times, and sequentially connecting multiple pseudo-random sequences with the same initial phase to form a modulated transmission symbol.
Constructing a baseband signal as follows;
firstly, carrying out channel coding on a message to obtain a coded bit stream D (t);
secondly, according to the symbol clock T provided by the timing generatorS,RPerforming 1->KRSerial/parallel conversion to obtain KR-bit parallel data stream, where each KR-bit parallel data duration TS,R(length of symbol time) equal to the pseudo-random sequence period time TCN times of;
then, according to a pseudo-random sequence period clock (simplified to a sequence period clock in the figure) and a pseudo-random sequence chip clock (simplified to a sequence chip clock in the figure) provided by a timing generator, a phase selection module generates pseudo-random sequence phase offsets corresponding to parallel data streams, and because a symbol clock and the sequence period clock are synchronous, N identical phase offsets can be generated within the same symbol duration;
finally, according to the sequence period clock provided by the time sequence generator, the sequence chip clock and N same phase offsets corresponding to the parallel data streams, adopting a preset keying modulation method to transmit the pseudo-random sequenceThe generator repeatedly generates N pseudo-random sequences with the same initial phase to form N pseudo-random sequence signals which are continuous in time and have the same initial phase
I.e. the baseband signal s (t).
Then, the generated baseband signal is subjected to carrier modulation to obtain an intermediate frequency carrier signal, then the intermediate frequency carrier signal is subjected to up-conversion processing to obtain a radio frequency carrier signal, and finally the radio frequency carrier signal is subjected to power amplification processing and sent to a transmitting antenna for broadcasting.
When BPSK carrier modulation is used, the radio frequency transmit signal is expressed as follows:
wherein, PsRepresenting the transmission power of the radio frequency signal, fcRepresenting the transmitted signal frequency. BPSK carrier modulation is only one example of the application of the present invention, and other carrier modulation methods such as QPSK, FSK, etc. may be used.
Aiming at the designed code shift keying modulation method for repeatedly shifting the phase for multiple times, the invention further designs a demodulation method for the code shift keying modulation for repeatedly shifting the phase for multiple times. Fig. 4 is a schematic block diagram of a conventional CSK modulated message receiver;
firstly, a radio frequency carrier signal received by a receiver antenna is processed by a radio frequency Front-End (RF Front-End) to output a digital intermediate frequency signal;
secondly, the digital intermediate frequency signal is mixed with an externally input local intermediate frequency signal and a carrier Doppler frequency offset signal of a received signal in a digital down-conversion module to complete digital down-conversion, orthogonal IQ two-path baseband data is output, and the IQ two-path data is output to a matched filtering module;
then, the matched filter module takes the received time length as T under the control of an externally input symbol clock and a pseudorandom sequence period clock (simplified to the sequence period clock in the figure)CThe IQ data block and the pseudo-random sequence generator clock and pseudo-random in the sequence periodThe pseudo-random sequence generated under the control of a sequence chip clock (simplified to the sequence chip clock in the figure) is subjected to correlation matching calculation, a correlation result is output to a correlation peak searching module, a local pseudo-random sequence phase corresponding to a correlation peak is searched, and the phase is converted into bit data to be output;
and finally, the bit data output by the correlation peak searching module passes through a channel decoding module to obtain transmitted text data.
Figure 5 shows a schematic block diagram of a teletext receiver arrangement according to the invention,
firstly, a radio frequency carrier signal received by a receiver antenna is processed by a radio frequency Front-End (RF Front-End) to output a digital intermediate frequency signal;
secondly, the digital intermediate frequency signal is mixed with an externally input local intermediate frequency signal and a carrier Doppler frequency offset signal of a received signal in a digital down-conversion module to complete digital down-conversion, orthogonal IQ two-path baseband data is output, and the IQ two-path data is output to a comb filter;
thirdly, transmitting the baseband IQ two paths of data to a comb filter, and superposing N groups of pseudo-random sequence data in the same symbol into 1 group of pseudo-random sequence data by the comb filter;
the comb filter is shown in fig. 6: the comb filter delays the input data for N-1 times in sequence under the control of an externally input pseudorandom sequence period clock (simplified to a sequence period clock in the figure), and the time of each time delay is the period time T of the pseudorandom sequence periodCSecond, the N-1 time delay data and the input data are superposed and then sent to a data interception module; secondly, the data interception module intercepts input data stream under the control of an externally input symbol clock and a sequence period clock, outputs data superposed for N times in the same symbol, and the data time length is pseudorandom sequence period time TCAnd second. And intercepting data and transmitting the intercepted data to a matched filtering module.
Then, the matched filter module receives the signal with length T under the control of the externally input symbol clock and sequence period clockCThe data block and the pseudo-random sequence generator are in sequence period clock and pseudo-random sequence chip clock (simplified as sequence in the figure)Column chip clock), and the correlation result is output to a correlation peak searching module, and the phase of the local pseudo-random sequence corresponding to the correlation peak is searched and converted into bit data to be output;
and finally, the bit data output by the correlation peak searching module passes through a channel decoding module to obtain transmitted text data.
In order to more intuitively embody the effectiveness of the multiple-repetition phase-shifting code shift keying modulation and demodulation method provided by the present invention, fig. 7 is a graph comparing the effect of the error rate of information transmission of the R-CSK of the present invention with the error rate of conventional CSK information, theoretical calculation is performed for the error rate performance of conventional CSK and R-CSK under the condition that the transmission information rate is consistent, and the related symbols and the corresponding relations are agreed as follows:
in conventional CSK, the pseudo-random sequence has a period time TCChip length of L and symbol time length of TSWherein T isS＝TCWhen K-bit is used to represent a symbol, the system is M2KThe information rate R is K/TS；
The coherent demodulation symbol error rate calculation formula of the conventional CSK modulation is as follows:
the formula converted into the bit error rate of the information is as follows:
in R-CSK, the pseudo-random sequence has a period time TCChip length of L and symbol time length of TS,RBy using KR-bit represents a symbol with repetition number N, K being satisfied to achieve a transmission rate consistent with the conventional CSKR＝NK,TS,R＝NTSThen carry M toR＝2NK＝MNInformation rate RR＝KR/TS,R＝NK/NTC＝K/TS＝R；
M of R-CSKRAnd substituting into a coherent demodulation symbol error rate calculation formula of CSK modulation to obtain a coherent demodulation symbol error rate calculation formula of R-CSK:
the formula converted into the bit error rate of the information is as follows:
for convenience of calculation, without loss of generality, K is 2 (i.e., M is 4) and N is 2 (i.e., M is 4)R16) was simulated, the effect is shown in fig. 7, and it can be seen that at the same information transmission rate and the same Eb/N0Under the condition of bit energy noise density ratio, the bit error rate of coherent demodulation information obtained by the R-CSK modulation method provided by the invention is lower than that obtained by a conventional CSK modulation method, and the transmission performance is better. The same conclusion can also be obtained from the information bit error rate calculation formula of the CSK modulation non-coherent demodulation. From fig. 7, it can be deduced that the R-CSK modulation method proposed by the present invention requires less bit energy for information transmission under the condition of the same bit error rate of the information. Or, in other words, under the condition that the error rate of the information bits is the same as the energy of the information bits, the R-CSK modulation method provided by the invention can obtain a higher information transmission rate.
In the code shift keying modulation and demodulation method with repeated phase shifting, the telegraph broadcasting sending end adopts the code shift keying modulation method with repeated phase shifting, so that compared with the conventional CSK, the invention can ensure that better information transmission error rate performance is obtained under the condition of the same effective information rate; the CSK modulation information transmission rate can be improved, meanwhile, the signal power density of a receiving end is kept unchanged, and the software and hardware cost and the power consumption of the receiving end for demodulating CSK messages are prevented from being greatly increased; the demodulation part adopts a comb filter, and superposes N groups of pseudo-random sequence data in the same received symbol into 1 group of pseudo-random sequence data, compared with the conventional CSK modulation which adopts the same pseudo-random sequence rate and the pseudo-random sequence period equal to the symbol length provided by the invention, the demodulation cost of the receiver can be effectively reduced while the same demodulation performance is ensured. The method is suitable for the fields of communication, navigation system design and the like.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (6)
1. A code shift keying modulation method for repeatedly shifting phase for multiple times is characterized in that: repeating the code shift keying modulation of the same phase for a pseudorandom sequence a plurality of times within the same transmission symbol, comprising the steps of:
firstly, performing code shift keying modulation on a given group of transmission messages by adopting a preset keying modulation method to obtain a pseudo-random sequence, wherein the phase of the pseudo-random sequence is controlled by the transmission messages;
then, repeating the code shift keying modulation process for multiple times, and sequentially connecting multiple pseudo-random sequences with the same initial phase to form a modulated transmission symbol.
2. The code shift keying modulation method of multiple repetition phase shifting according to claim 1, wherein: the baseband signal is constructed as follows,
firstly, carrying out channel coding on a message to obtain a coded bit stream D (t);
secondly, according to the symbol clock provided by the time sequence generator, the bit stream corresponding to the encoded text is processed by 1->KRSerial/parallel conversion to obtain parallel data streams, where each KR-the bit parallel data duration, i.e. the symbol time length, is equal to N times the pseudo-random sequence period time;
then, according to the pseudo-random sequence periodic clock provided by the time sequence generator, the phase selection module generates the pseudo-random sequence phase offset corresponding to the parallel data stream;
finally, according to the pseudo-random sequence period clock provided by the time sequence generator, the pseudo-random sequence chip clock and the phase offset corresponding to the parallel data stream, a preset keying modulation method is adopted to repeatedly carry out code shift keying modulation on the pseudo-random sequence generated by the pseudo-random sequence generator for multiple times, and the modulated pseudo-random sequence is obtained
I.e. the baseband signal s (t).
3. The code shift keying modulation method of multiple repetition phase shifting according to claim 2, wherein: the symbol clock is integral multiple of the pseudo-random sequence period clock and is synchronous with the pseudo-random sequence period clock.
4. The code shift keying modulation method of multiple repetition phase shift according to claim 2, wherein: constructing a radio frequency transmission signal as follows;
firstly, carrying out carrier modulation on a generated baseband signal S (t) to generate an intermediate frequency carrier signal, wherein the modulation adopts BPSK, QPSK, FSK or other equivalent carrier modulation modes;
secondly, performing up-conversion on the generated intermediate frequency carrier signal to a required transmitting frequency to generate a radio frequency carrier signal;
and then, performing power amplification on the generated radio frequency carrier signal, and sending the radio frequency carrier signal to a transmitting antenna.
5. A demodulation method for the multiple-repetition phase-shifting code shift keying modulation method of any one of claims 1 to 4, characterized in that: before the related matched demodulation message, the comb filter is adopted to superpose the received baseband data, thereby reducing the signal processing workload of the demodulation message at the receiving end,
firstly, a radio frequency carrier signal received by a receiver antenna is processed by a radio frequency front end to output a digital intermediate frequency signal;
secondly, the digital intermediate frequency signal is transmitted to a digital down-conversion module, and the digital down-conversion module converts the digital intermediate frequency signal into IQ two-path orthogonal baseband signals under the action of a local intermediate frequency signal of an externally input receiver and a carrier Doppler frequency offset signal in a received signal;
thirdly, transmitting the IQ two-path orthogonal baseband signals to a comb filter, and controlling N time lengths in the same symbol period to be T by the comb filter under the control of an externally input symbol clock and a pseudo-random sequence period clockCIs converted into a data block with a time length of TCAnd outputting the result to the matched filtering module;
then, the matched filter module takes the received time length as T under the control of an externally input symbol clock and a pseudo-random sequence period clockCThe data block is subjected to correlation matching calculation with a pseudo-random sequence generated by a local pseudo-random sequence generator, a correlation result is output to a correlation peak searching module, a local pseudo-random sequence phase corresponding to a correlation peak is searched, and the phase is converted into bit data to be output;
and finally, the bit data output by the correlation peak searching module passes through a channel decoding module to obtain transmitted text data.
6. The method of claim 5, wherein: the comb filter is implemented as follows:
firstly, the comb filter delays the input data for N-1 times in sequence under the control of the pseudo-random sequence period clock input externally, and the pseudo-random sequence period time T is delayed every timeCSecond, the N-1 time delay data and the input data are superposed and then sent to a data interception module;
secondly, the data interception module intercepts input data flow under the control of an externally input symbol clock and a pseudo-random sequence period clock, outputs data superposed for N times in the same symbol, and the data time length is pseudo-random sequence period time TCAnd second.
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| WO2021120027A1 (en) * | 2019-12-18 | 2021-06-24 | 航天恒星科技有限公司 | Message signal broadcasting method and device employing phase discontinuity r-csk modulation |
| CN111917435B (en) * | 2020-01-07 | 2021-10-22 | 大连理工大学 | Multimodal code shift keying signal synchronization method based on peak delay difference |
| WO2022000442A1 (en) * | 2020-07-03 | 2022-01-06 | 航天恒星科技有限公司 | Bipolar csk modulation-based composite message signal broadcasting method and apparatus |
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| CN113315540B (en) * | 2021-03-16 | 2023-03-17 | 上海磐启微电子有限公司 | Modulation and demodulation method based on pseudo-random phase sequence spread spectrum signal |
| CN114624746B (en) * | 2022-03-07 | 2023-01-17 | 北京凯芯微科技有限公司 | CSK modulation symbol decoding method, device, chip and satellite receiver |
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| FR2986927B1 (en) * | 2012-02-13 | 2016-09-23 | Univ Bretagne Sud | METHOD FOR TRANSMITTING NON-BINARY ERROR CORRECTING CODE WORDS WITH CCSK MODULATION, SIGNAL AND CORRESPONDING DEVICE |
| CN103152074B (en) * | 2013-02-17 | 2015-08-12 | 哈尔滨工程大学 | A kind of direct sequence spread spectrum communication system launching and receiving method |
| CN104298897B (en) * | 2014-09-04 | 2017-04-12 | 广西师范大学 | embedded copyright authentication method based on chaos technology and special processor |
| CN104468451B (en) * | 2014-12-10 | 2017-10-24 | 北京理工大学 | A kind of multiple stage circulation shift keying modulation demodulation method based on transform-domain communication |
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2018
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- 2018-11-01 WO PCT/CN2018/113492 patent/WO2020047984A1/en active Application Filing
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| WO2020047984A1 (en) | 2020-03-12 |
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